scholarly journals Atomic, Molecular and Cluster Science with the Reaction Microscope Endstation at FLASH2

2020 ◽  
Vol 10 (8) ◽  
pp. 2953 ◽  
Author(s):  
Severin Meister ◽  
Hannes Lindenblatt ◽  
Florian Trost ◽  
Kirsten Schnorr ◽  
Sven Augustin ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
Single Pulse ◽  
Pump Probe ◽  
Electrons And Ions ◽  
Fragmentation Reactions ◽  
Small Clusters ◽  
Reaction Microscope

The reaction microscope (REMI) endstation for atomic and molecular science at the free-electron laser FLASH2 at DESY in Hamburg is presented together with a brief overview of results recently obtained. The REMI allows coincident detection of electrons and ions that emerge from atomic or molecular fragmentation reactions in the focus of the extreme-ultraviolet (XUV) free-electron laser (FEL) beam. A large variety of target species ranging from atoms and molecules to small clusters can be injected with a supersonic gas-jet into the FEL focus. Their ionization and fragmentation dynamics can be studied either under single pulse conditions, or for double pulses as a function of their time delay by means of FEL-pump–FEL-probe schemes and also in combination with a femtosecond infrared (IR) laser. In a recent upgrade, the endstation was further extended by a light source based on high harmonic generation (HHG), which is now available for upcoming FEL/HHG pump–probe experiments.

scholarly journals High Repetition Rate and Coherent Free-Electron Laser in the X-Rays Range Tailored for Linear Spectroscopy

Instruments ◽  
2019 ◽  
Vol 3 (3) ◽  
pp. 47 ◽  
Author(s):  
Vittoria Petrillo ◽  
Michele Opromolla ◽  
Alberto Bacci ◽  
Illya Drebot ◽  
Giacomo Ghiringhelli ◽  
...  
Keyword(s):  
Free Electron ◽  
Repetition Rate ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Repetition Rate ◽  
X Rays ◽  
Regenerative Amplifier ◽  
X Ray ◽  
High Repetition

Fine time-resolved analysis of matter—i.e., spectroscopy and photon scattering—in the linear response regime requires fs-scale pulsed, high repetition rate, fully coherent X-ray sources. A seeded Free Electron Laser (FEL) driven by a Linac based on Super Conducting cavities, generating 10 8 – 10 10 coherent photons at 2–5 keV with 0.2–1 MHz of repetition rate, can address this need. Three different seeding schemes, reaching the X-ray range, are described hereafter. The first two are multi-stage cascades upshifting the radiation frequency by a factor of 10–30 starting from a seed represented by a coherent flash of extreme ultraviolet light. This radiation can be provided either by the High Harmonic Generation of an optical laser or by an FEL Oscillator operating at 12–14 nm. The third scheme is a regenerative amplifier working with X-ray mirrors. The whole chain of the X-ray generation is here described by means of start-to-end simulations.

scholarly journals Two-colour pump–probe experiments with a twin-pulse-seed extreme ultraviolet free-electron laser

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
E. Allaria ◽  
F. Bencivenga ◽  
R. Borghes ◽  
F. Capotondi ◽  
D. Castronovo ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
Pump Probe

scholarly journals Reaction microscope endstation at FLASH2

2019 ◽  
Vol 26 (3) ◽  
pp. 854-867 ◽  
Author(s):  
Georg Schmid ◽  
Kirsten Schnorr ◽  
Sven Augustin ◽  
Severin Meister ◽  
Hannes Lindenblatt ◽  
...  
Keyword(s):  
Gas Phase ◽  
Extreme Ultraviolet ◽  
Time Resolved ◽  
Pump Probe ◽  
Natural Time ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Probe Spectroscopy ◽  
Small Clusters ◽  
Reaction Microscope

A reaction microscope dedicated to multi-particle coincidence spectroscopy on gas-phase samples is installed at beamline FL26 of the free-electron laser FLASH2 in Hamburg. The main goals of the instrument are to follow the dynamics of atoms, molecules and small clusters on their natural time-scale and to study non-linear light–matter interaction with such systems. To this end, the reaction microscope is combined with an in-line extreme-ultraviolet (XUV) split-delay and focusing optics, which allows time-resolved XUV-XUV pump–probe spectroscopy to be performed.

scholarly journals High harmonic generation in mixed XUV and NIR fields at a free-electron laser

2021 ◽  
Author(s):  
Jan Troß ◽  
Shashank Pathak ◽  
Adam Summers ◽  
Dimitrios Rompotis ◽  
Benjamin Erk ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Free Electron ◽  
Free Electron Laser ◽  
Near Infrared ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Order ◽  
Phase Matching ◽  
Model Calculations ◽  
High Order Harmonic

Abstract We present the results of an experiment investigating the generation of high-order harmonics by a femtosecond near-infrared (NIR) laser pulse in the presence of an extreme ultraviolet (XUV) field provided by a free-electron laser, a process referred to as XUV-assisted high-order harmonic generation (HHG). Our experimental findings show that the XUV field can lead to a small enhancement in the harmonic yield when the XUV and NIR pulses overlap in time, while a strong decrease of the HHG yield and a red shift of the HHG spectrum is observed when the XUV precedes the NIR pulse. The latter observations are in qualitative agreement with model calculations that consider the effect of a decreased number of neutral emitters but are at odds with the predicted effect of the correspondingly increased ionization fraction on the phase matching. Our study demonstrates the technical feasibility of XUV-assisted HHG experiments at free-electron lasers, which may provide new avenues to investigate correlation-driven electron dynamics as well as novel ways to study and control propagation effects and phase matching in HHG.

Generation and measurement of intense few-femtosecond superradiant extreme-ultraviolet free-electron laser pulses

2021 ◽  
Author(s):  
Najmeh S. Mirian ◽  
Michele Di Fraia ◽  
Simone Spampinati ◽  
Filippo Sottocorona ◽  
Enrico Allaria ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
Laser Pulses

scholarly journals Observation of a highly conductive warm dense state of water with ultrafast pump–probe free-electron-laser measurements

2021 ◽  
Vol 6 (5) ◽  
pp. 054401
Author(s):  
Z. Chen ◽  
X. Na ◽  
C. B. Curry ◽  
S. Liang ◽  
M. French ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Pump Probe ◽  
Laser Measurements ◽  
State Of Water ◽  
Dense State

scholarly journals Double chirp-taper x-ray free-electron laser for attosecond pump-probe experiments

2019 ◽  
Vol 22 (5) ◽  
Author(s):  
Zhen Zhang ◽  
Joseph Duris ◽  
James P. MacArthur ◽  
Zhirong Huang ◽  
Agostino Marinelli
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Pump Probe ◽  
X Ray

scholarly journals A novel free-electron laser single-pulse Wollaston polarimeter for magneto-dynamical studies

2021 ◽  
Vol 8 (3) ◽  
pp. 034304
Author(s):  
Antonio Caretta ◽  
Simone Laterza ◽  
Valentina Bonanni ◽  
Rudi Sergo ◽  
Carlo Dri ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Single Pulse

scholarly journals Measuring the frequency chirp of extreme-ultraviolet free-electron laser pulses by transient absorption spectroscopy

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Thomas Ding ◽  
Marc Rebholz ◽  
Lennart Aufleger ◽  
Maximilian Hartmann ◽  
Veit Stooß ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Transient Absorption ◽  
Extreme Ultraviolet ◽  
Ultrashort Pulses ◽  
Laser Pulses ◽  
Transient Absorption Spectroscopy ◽  
Energy Structure ◽  
Frequency Chirp

AbstractHigh-intensity ultrashort pulses at extreme ultraviolet (XUV) and x-ray photon energies, delivered by state-of-the-art free-electron lasers (FELs), are revolutionizing the field of ultrafast spectroscopy. For crossing the next frontiers of research, precise, reliable and practical photonic tools for the spectro-temporal characterization of the pulses are becoming steadily more important. Here, we experimentally demonstrate a technique for the direct measurement of the frequency chirp of extreme-ultraviolet free-electron laser pulses based on fundamental nonlinear optics. It is implemented in XUV-only pump-probe transient-absorption geometry and provides in-situ information on the time-energy structure of FEL pulses. Using a rate-equation model for the time-dependent absorbance changes of an ionized neon target, we show how the frequency chirp can be directly extracted and quantified from measured data. Since the method does not rely on an additional external field, we expect a widespread implementation at FELs benefiting multiple science fields by in-situ on-target measurement and optimization of FEL-pulse properties.

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